Optimized for SRS/SRT climbing on 13 mm (1/2") lines. Ever use a wrench on your 1/2" line and feel it just struggle a bit? The RP283 combo is smooth as silk. This wrench was designed for 13 mm lines and you'll appreciate and love it, especially maneuvering on SRS limb walks. Includes: (1) x ISC Rope Wrench RP283 & (1) x @Height's 12" double tether